Which unit of distance equals 220 yards, or one-eighth of a mile?

What is a wide, triangular necktie knot called? How many sides does a typical snowflake have? Which number of degrees means a U-turn or a complete reversal of opinion? Which unit used in commerce equals 42 gallons of crude oil? Which unit of energy does the abbreviation kWh stand for? What is a local unit of Girl Scouts called? In measuring pressure, what does "psi" stand for? Which United Nations agency is known by the initials WHO?